Flocculation and Flotation to Recover Protein-Enriched Biomasses from Shrimp Boiling and Peeling Process Waters: A Case Study
Artikel i vetenskaplig tidskrift, 2020

A novel integrated process for the recovery of protein-enriched biomasses from shrimp boiling water (SBW) and shrimp peeling water (SPW) was investigated by combining flocculation (F) and dissolved air flotation (DAF) into an F-DAF process. Alginate and carrageenan were used as flocculants. It was found that the protein yield from SPW and SBW in the F-DAF process was 68-97% and 26-45%, respectively. This led to a reduction in protein content of the influent SBW and SPW (12.4 and 1.4 g/L, respectively) by up to 76% and 85%, resulting in outlets with 2.9 and 0.2 g/L protein, respectively. Further, the F-DAF recovery process concentrated the proteins of SBW and SPW up to 7 and 29 times, respectively, thus, generating a protein-enriched biomass. After spray drying, biomass from SBW had up to 61% proteins and out of the total amino acids, up to 47% were essential ones. Further, the spray dried powder contained up to 23% total lipids, 2.7% long chained n-3 polyunsaturated fatty acids and 49.7 mg/g total astaxanthin. The studied F-DAF recovery system can thus be successfully used for recovering nutrients from process waters generated during the production of peeled shrimps.

protein recovery


Shrimp processing


circular economy




Bita Forghani Targhi

Chalmers, Biologi och bioteknik, Livsmedelsvetenskap

Ann-Dorit Moltke Sørensen

Danmarks Tekniske Universitet (DTU)

Johan Johannesson

Örneborgs delikatesser AB

Räkor & Laxgrossisten AB

Tore C. Svendsen

Bio-Aqua A/S

Aquarden Technologies ApS

Ingrid Undeland

Chalmers, Biologi och bioteknik, Livsmedelsvetenskap

ACS Sustainable Chemistry & Engineering

2168-0485 (eISSN)

Vol. 8 26 9660-9668

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